Grainy black spots in pictures after export. HELP

I got a problem and I need advice quick! I do slideshow videos for wedding rehearsal dinners/receptions and I have one in Saturday. Some pictures in my slideshow are scanned in, some were put onto my MBP through a CD, the problem i have is that in every photo in the video there, where there is black in the picture, there is horrible, grainy dots things that take away from the meaning of these pictures. I'm using iMovie '09, and exporting in QT, because the video is going to be shown on a HD projector. It will be shown in 1080p. I need to know what i can do to get rid of the grainy spots in the pictures so i have a better quality video for this wedding. Any advice is greatly appreciated!

Don't the "grainy spots" appear when you look at the photos in iPhoto or 'QuickLook' when you've put them into your Mac?
Which camera did you use to shoot the pictures? Did you shoot in dark suroundings, at a high ISO number, like 1600 or higher?
"..Some pictures in my slideshow are scanned in.." ..scanned in from prints?
"..some were put onto my MBP through a CD.." ..you mean that the photos were first burned onto a CD ..from the digital originals, or also scanned from prints?
Do the "grainy spots" only appear when you introduce the pics into iMovie?
It sounds like these pics may be "under-exposed", and the video processing in iMovie is trying to gather detail which may not be there.
Can you post an example somewhere?
It may be far better to make a slideshow in iPhoto - which is a photo-handling program, rather than use iMovie, which is a movie-handling program.

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Grainy black spots in pictures after export. HELP

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